Ernst Zinner and Donald Clayton converse at the conference *The Solar System
and the Galaxy*, Tucson, January 1985. They discussed possibility of finding
Stardust with secondary-ion mass spectrometry (SIMS). Clayton had predicted
Stardust isotopic identifiers since 1975, and Zinner had developed SIMS
capability to the point of detecting D-rich interplanetary dust particles,
as he reported in Houston in 1984. Clayton's paper in Tucson (see the book)
was on a local model for the 26Al gamma radiation that had just been
detected.